after you leave the wake, at the top of your air, let go of your front hand. the rope pulling on your rear hand will turn your body. that's it. other than that, as everyone else said, ride switch a lot to get used to it. landing switch isn't that hard.

maybe try it on an inside-out wake jump first. then a one-wake jump. then take it wake to wake.

Also, don't forget that if you snowboard in the winter you should spend a substantial amount of time riding switch to get the feeling. That feeling will translate to the water next summer. One run regular, one run switch. Great practice when the snow sucks.